Ä82 Siphonoecetes 



Ann. nat. Hist., ser. 2 v.l9 p. 149 | 1862 Siphonoecetes (Siphonaecetus), Bäte & Westwood, 

 hrit. sess. Crust., v. 1 p. 463, 467 | 1862 SipJwnoecetus (part.), Bäte, Cat. Amphip. Brit. 

 Mus., p.268 I 1871 S., A. Boeck in: Forh. Selsk. Christian., 1870 p.257 | 1873 Siphono- 

 coetus, A. Marschall, Nomencl. zool!, p. 420 | 1887 Sijihonaecetes, Chevreux in: Bull. 

 Soc. zool. France, v. 12 p. 290, 317. 



Body slender, peraeon much longer than pleon. Head subquadrate. 

 Side-plates very shallow, setulose, 1^* subacute in front, 5*^\ 6**1 much 

 produced backward. Eyes, when present, placed on front corners of head. 

 Antennae 1 and 2 setose. Antenna 1, peduncle much longer than fiagellura, 

 its 3 joints subequal, without accessory flagellum. Antenna 2 much longer, 

 stouter; flagellum short, of 1 long and 2 short joints, with unguiform 

 spines at apex. Upper lip rouuded or faintly bilobed. Lower lip with the 

 mandibular processes narrow. Mandible with palp of 1 setose Joint, molar 

 with accessory plate, otherwise normal. Maxiila 1, inner plate obsolete, outer with 

 7 apical spines; palp long, with 6 spines on apex of 2'^ Joint and some setae 

 on outer margin. Maxiila 2, inner plate fringed on inner margin. Maxillipeds 

 normal; last Joint of palp very small, tipped with spines. Gnathopod 1 

 without distinct palm. Gnathopod 2 stronger, distinctly subchelate. Peraeo- 

 pods 1 and 2, 2"^ Joint strongly expanded, glandulär, 4*^ Joint broad, cordi- 

 form, S'^'minute; iinger long, straight. Peraeopods 3 and 4, 2*^ and 4^^ joints 

 not much expanded. 5*^» short, broad, distally scabrous; finger reverted, 

 bidentate. Peraeopod 5 normal; 2'^ Joint not broad, densely setose, finger 

 as in peraeopods 3 and 4. Branchial vesicles and marsupial plates naiTow. 

 Pleopods 1 — 3, peduncle very broadly expanded; the 2 coupling spines 

 very slender, with 3 or 4 teeth on each side; 1^* Joint of inner ramus with 

 smoothly concave inner margin. Uropod 1, peduncle longer than outer 

 ramus, each spinulose on outer margin; inner ramus sliorter than outer, 

 spinulose on inner margin. Uropod 2 similar to uropod 1, but smaller. 

 Uropod 3 short, peduncle broadly produced on inner side; ramus very small, 

 tipped with setae. Telson broader than long, apically rounded, 2 small 

 patches of microscopic spinules flanking the apex. Occupying tubes, 

 constructed or adapted. 



5 accepted species, 1 obscure. 

 Synopsis of accepted species: 



j Eyes not well developed — 2. 



) Eyes well developed — 3. 



I Antenna 1, flagellum less than half as long as 



peduncle 1. S. typicus p. 682 



2 



\ Antenna 1, flagellum more than half as long 



as peduncle 2. S. pallidus p. 683 



{Uropod 3, raraus more than half as long as 



peduncle 3. S. colletti p 683 

 Uropod 3, ramus not more than half as long 

 as peduncle — 4. 



/ Uropods 1 and 2, rami stout and strongly spined 4. S. dellavallei . . . . p. 684 

 4 { Uropods 1 and 2, rami slight and not strongly 



l spined 5. S. sabatieri p. 684 



1. S. typious Kr0yer 1845 S. t., Kreyer in: Naturh. Tidsskr., ser. 2 v.l p.481 

 t. 7 f.4a-f j 1846 S. t, Kreyer in: Voy. Nord, Crust. t. 20 f. la— v | 1893 S. t (part.), 

 A. DellaValle in: F. Fl. Neapel, ».20 p. 358. 



Body cylindric but ventrally flattened; peraeon about \ of total 

 length. Head, rostrum and front angles not very prominent. Side-pTate 5 



